This video, edited down to slow-motion to show details, depicts an NYPDofficer using pepper spray on "Occupy Wall Street" protesters onSaturday as they marched near Union Square.

NYPD Deputy Commissioner Paul Browne confirmed to Metro that police usedpepper spray once, on protesters penned in by orange mesh policebarricades. The women appear unarmed when they are sprayed in the faceby cops, and scream in pain after the spray hits their eyes.

Browne defended the decision to use the spray: He said the womenconfronted the officers and tried to prevent them from erecting the meshbarrier.

Browne said he's wary that protesters are editing video to make the police look bad.

"Pepper spray was used once after individuals confronted officers andtried to prevent them from deploying a mesh barrier -- something thatwas edited out or otherwise not captured on the video," he told Metro.

He also warned, "Those who resist arrest can expect some measure of force will used."